POST UTME LEAD CITY UNIVERSITY 2019 Chemistry | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The reaction between sodium hydroxide and hydrochloric acid is represented by the equation \( NaOH + HCl \rightarrow NaCl + H_2O \). What is the type of reaction?
A. Synthesis
B. Decomposition
C. Replacement
D. Neutralization
Question 2
The diagram below shows a periodic table. What is the symbol for the element with atomic number 6?
A. C
B. N
C. O
D. F
Question 3
A solution of 0.1 M NaOH is mixed with a solution of 0.1 M HCl. What is the pH of the resulting solution?
A. 7
B. 8
C. 9
D. 10
Question 4
A 0.500 g sample of a metal oxide is heated in a crucible until it decomposes completely. The mass of the metal obtained is 0.350 g. If the metal oxide has the formula MO and the metal has the formula M, what is the empirical formula of the metal oxide?
A. M2O3
B. MO2
C. M2O
D. MO
Question 5
A solution containing 0.100 M NaOH is mixed with a solution containing 0.100 M HCl. What is the concentration of the resulting solution?
A. 0.100 M
B. 0.0500 M
C. 0.200 M
D. 0.050 M
Question 6
A sample of sulfur hexafluoride gas occupies a volume of 3.0 L at a pressure of 2.0 atm and a temperature of 30°C. Calculate the number of moles of sulfur hexafluoride gas present.
A. 0.75 mol
B. 1.0 mol
C. 1.25 mol
D. 1.5 mol
Question 7
The solubility of a subs\tance in water is 0.5 g/100 mL. What is the molar solubility of the subs\tance?
A. 0.0278 mol/L
B. 0.278 mol/L
C. 0.0278 g/L
D. 0.0278 g/mol
Question 8
The reaction between methane and chlorine is represented by the equation \( CH_4 + Cl_2 \rightarrow CH_3Cl + HCl \). What type of reaction is this?
A. Combustion
B. Synthesis
C. Decomposition
D. Substitution
Question 9
A sample of nitrogen gas occupies a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 20°C. Calculate the number of moles of nitrogen gas present.
A. 0.25 mol
B. 0.50 mol
C. 0.75 mol
D. 1.0 mol
Question 10
A 0.1 M solution of a weak acid, HA, is titrated with 0.1 M NaOH. At the equivalence point, the pH of the solution is 7. What is the pKa of the acid?
A. 4.5
B. 5.5
C. 6.5
D. 7.5
Question 11
What is the effect of pH on the rate of a reaction?
A. pH has no effect on the rate of reaction
B. pH increases the rate of reaction
C. pH decreases the rate of reaction
D. pH has a negligible effect on the rate of reaction
Question 12
The pH of a solution is given by the equation \( pH = -\log[H^+] \). If the pH of a solution is 4.5, what is the concentration of hydrogen ions?
A. 1.0 x 10^-5 M
B. 1.0 x 10^-4 M
C. 1.0 x 10^-3 M
D. 1.0 x 10^-2 M
Question 13
A 2.5 L flask contains 0.75 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 2.5 atm
B. 3.0 atm
C. 3.5 atm
D. 4.0 atm
Question 14
The reaction of sodium with water is an example of a ______________ reaction.
A. displacement
B. decomposition
C. neutralization
D. oxidation
Question 15
A 0.1 M solution of a weak base, B, is titrated with 0.1 M HCl. At the equivalence point, the pH of the solution is 7. What is the pKa of the base?
A. 4.5
B. 5.5
C. 6.5
D. 7.5

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